Fix timeout logic in AcquireSpinLock(). It could fail if the end time...

Fix timeout logic in AcquireSpinLock().  It could fail if the end time computed was larger than the roll over value of the performance counter.  The timeout logic now accumulates the total time elapsed to determine if the timeout has been exceeded.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@4345 6f19259b-4bc3-4df7-8a09-765794883524